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The other planets do have gravity.
Since no one from Earth has visited another planet, and we have no indication that there is anyone on the other planets, Earth does not help other planets in any way. Why do you think there is something Earth does to help them- whoever them is.
Earth and the other planets are mostly made of rock.
Astronomers have found Earth-sized planets in other solar systems.
No, other planets are rotating at other speeds.
It is estimated that the Solar System is 4.6 billion years old including Earth and the other planets.
Earth's scientist have not found life on other planets to date.
Studying the earth helps scientists to understand other planets since the earth is part of the solar system. Scientists use the features of the earth to compare them with what other planets hold.
well some planets are bigger than the earth but from the inside earth is of course bigger than all of the other planets
The other planets - and all other bodies - orbit the earth.
Yes. Besides earth there are seven other major planets and 5 recognised dwarf planets.
Other planets do not have water nor life